KR100899416B1 - Apparatus for removal of non point source pollution using a vortex screen - Google Patents

Abstract

The present invention relates to a non-point source removal device equipped with a swirl-flow screen having an open protrusion shape in a hydrodynamic separator (HDS), comprising a chamber 60 and a chamber 60. An inlet pipe 10 formed on one side and leading the contaminated rainwater into the swirl flow-type screen 20, a swirl flow-type screen 20 installed inside the chamber 60 and regularly arranged with an open protrusion 22, Discharge water passage 30 which is located between the swirl flow-type screen and the chamber and guides the treated water in which the pollutant is separated by the swirl flow-type screen 20 to the discharge portion 40, the other side of the chamber is formed It is composed of a discharge portion 40 for discharging to the outside and a solids collecting portion 50 located in the lower portion of the swirl flow-type screen to collect and store the removed solids, according to the present invention As a result, it is possible to provide a non-point source removal device having easy maintenance and high processing efficiency.

Swirl flow, screen, open protrusion, nonpoint source

Description

Non-point source removal device using swirl flow screen {APPARATUS FOR REMOVAL OF NON POINT SOURCE POLLUTION USING A VORTEX SCREEN}

1 is a perspective view of a non-point source removal apparatus using the swirl flow screen of the present invention.

Figure 2 is a longitudinal cross-sectional view of a non-point source removal apparatus using a swirl flow screen of the present invention.

3 is a plan view of a non-point source removal apparatus using the swirl flow screen of the present invention.

Figure 4 is a schematic view of the operation of the non-point source removal apparatus using a swirl flow screen of the present invention.

5 is a fluid flow diagram of a non-point source removal apparatus using the swirl flow screen of the present invention.

* Explanation of symbols on the main parts of the drawing

10: inlet pipe

20: Swirl flow screen 21: Flat portion 22: Open projection

30: discharge water

40: discharge part

50: solids collecting part

60: chamber

The present invention relates to a non-point source removal device for purifying a non-point source generated in urban areas during rainfall, and more particularly, to an improved type equipped with an open projection screen inside a hydrodynamic separator (HDS). It relates to a non-point source removal device.

Pollutants generated in urban areas can be largely classified into point source pollution and non-point source pollution.

First, point source refers to a source that can easily identify the source of pollutants because household sewage and industrial wastewater are discharged through the discharge pipe. Even though the point source is very high, the point source is specified. Therefore, it is possible to perform easy water treatment through intensive purification.

Next, referring to the nonpoint source, when rainwater is contaminated by fertilizers, pesticides, dust, oils, etc. accumulated in roads, farmland, parking lots, etc., the contaminated rainwater moves along the surface. The point is not clear, but non-point sources such as this polluted rainwater are called nonpoint sources. These nonpoint sources are initially highly polluted but are less polluted over time, but contaminated areas are widely distributed. Therefore, intensive water treatment is very difficult.

 Based on these distinctive characteristics, in the water quality field, pollutants such as domestic sewage, industrial wastewater, and livestock wastewater are classified as point sources, and pollutants accumulated on roads, farmland, parking lots, and golf courses are classified as cotton or nonpoint sources.

Since the nonpoint source is dispersed in a large area and intensively flows only during rainfall, it has not been recognized the seriousness of the problem as a source of pollution. Today, however, due to the environmental pollution, the non-point source has been highlighted with the acidification of rainwater. In particular, effluent from the first-flush that occurs early in the rain has high concentration of pollutants and high probability of containing toxic substances such as heavy metals. have.

The facilities that are applied as nonpoint source treatment facilities include reservoir type using artificial wetland, swirl type using centrifugal force, and filter type using filtration tank. Among them, storage type is mainly adopted as nonpoint source treatment facility in Korea.

The storage non-point source treatment facility is capable of large-capacity treatment of rainwater, but has a problem that is difficult to apply to the urban areas where space is insufficient because the treatment facility must be large.

In addition, in the case of the filtration type, the treatment efficiency is high, but it is difficult to maintain and replace the filter material, and the maintenance cost is high. There is a difficult issue.

On the other hand, the swirl flow type does not plan to replace the filter media, so it is easy to maintain and requires relatively less land than the filter type in terms of processing capacity. However, the processing efficiency is lower than that of the filtration type, and since a complicated internal structure is used to form an efficient swirl flow, there is a problem that it is difficult to repair the defect when a problem such as closing or breakage occurs.

Accordingly, the inventors of the present invention have continued to find a way to improve the treatment efficiency in the swirl flow type non-point source removal device suitable for adoption in urban areas and large processing capacity.

An object of the present invention is to provide a non-point source removal apparatus capable of large-capacity treatment for non-point source, having a high-efficiency treatment capability, and easy maintenance.

These and other objects can be achieved by the present invention described below.

Aspect of the present invention for achieving the above object is the chamber 60 constituting the main body, the inlet pipe 10 to guide the contaminated rainwater formed in one side of the chamber 60 into the swirl flow-type screen 20, The swirling flow screen 20 is installed inside the chamber 60 and the open projection 22 is regularly arranged, and is located between the chamber 60 and the swirl flow screen 20 by the swirl flow screen 20. The discharge passage 30 for guiding the treated water from which the pollutants are separated to the discharge portion 30, the discharge portion 40 formed at the other side of the chamber 60, and the discharge portion 40 for discharging the treated water to the outside and the swirling flow type screen 20 It relates to a non-point source removal apparatus including a solids collecting unit 50 located in the lower portion to collect and store the removed solids.

The non-point source removal apparatus of the present invention is characterized by applying a swirl flow type screen in which the open protrusions 22 are regularly arranged inside the chamber 60 for high processing efficiency and processing capacity.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Chamber 60 according to the present invention forms the main body of the non-point source removal apparatus as shown in Figure 1, the inlet pipe 10 to guide the rainwater contaminated on one side to the inside of the swirl flow type screen, the treated water to the other side The discharge portion 40 discharged to the outside is mounted, the swirl flow screen 20 is installed inside, the discharge passage 30 is located between the chamber and the swirl flow screen, the lower portion of the swirl flow screen 20 The solids collecting portion 50 is located.

Inlet pipe 10 of the present invention is formed on one side of the chamber 60 serves to guide rainwater into the swirl flow-type screen (20).

As shown in FIG. 3, the inflow pipe 10 gradually decreases the water flow area during rainwater inflow in the tangential direction of the swirl flow-type screen 20, which reduces the water flow area by Bernoulli's principle. This is because the speed is increased to form a swirl flow more effectively. More preferably, the inflow pipe 10 into which the contaminated rainwater flows in may be curved in one side to gradually reduce the water flow area. This is because it is possible to secure energy capable of efficiently forming the swirl flow by gradually maximizing the initial velocity of rainwater flowing into the flat portion 21 of the swirl flow screen.

The swirl flow-type screen 20 according to the present invention separates solids larger than the openings of the open protrusions from rainwater by the open protrusions 22 protruding therein as shown in the driving schematic of FIG. Thereby removing the solids smaller than the openings from the rainwater. The removed solids are collected and stored in the solids collecting unit 50 located below by gravity and swirl flow.

As shown in FIG. 3, the contaminated rainwater induced from the inlet pipe 10 to the swirling flow screen 20 is accelerated in the inflow pipe 10 and is accelerated by the flat portion 21 of the swirling flow screen. By maintaining the effective swirl flow in the screen. The swirl flow is formed by rotating in the direction of the opening at the tip of the open protrusion, in which a relatively large solid is removed from the rainwater by the open protrusion, and the relatively small solid is separated from the rainwater by the swirl flow.

The treated water from which the contaminated solids are separated is discharged to the discharge part 40 through the discharge channel 30, and the contaminated solids are not blocked by the swirl flow screen but are disposed under the solids by gravity and swirl flow. 50). The reason why the solid is not occluded in the swirl flow-type screen is due to the shape of the screen in which the swirl flow formed inside the swirl flow-type screen and the open protrusions 22 described below are regularly arranged.

The swirl flow-type screen 20 of the present invention has a form in which the open protrusions 22 are regularly arranged on the inside as shown in FIG. 2, and manufactured in a cylindrical shape and installed inside the chamber 60, and the open protrusions 22. ), Streamlined, semi-conical, triangular pyramidal, wedge-shaped, etc. are applicable to reduce the resistance to rainwater flowing in, and preferably semi-conical.

The open protrusions 22 protrude into the swirl flow-type screen 20 as shown in FIGS. 3 and 5, and the openings of the open protrusions face the rainwater guided from the inlet pipe 10. It is characterized by being open. This is because the solids of the rainwater are embedded directly in the open projection openings when they open in the opposite direction to the rainwater, causing a blockage of the entire swirling flow screen.

In addition, the swirl flow-type screen 20 of the present invention, as shown in Figure 3 includes a flat portion 21 without the open projection 22 in the tangentially meet the inlet pipe 10, which is the rainwater inflow When in contact with the planar portion, the initial velocity of rain is maintained to form an efficient swirl flow inside the screen 20.

The discharge passage 30 of the present invention is located between the swirling flow screen 20 and the chamber 60 and guides the treated water separated from the solid by the swirling flow screen 20 to the discharge portion 40. Function.

Discharge part 40 of the present invention is installed on the other side of the chamber, and serves to discharge the treated water derived from the discharge passage 30 to the outside.

The solid collecting unit 50 of the present invention is located under the swirling flow screen, and performs a function of collecting and storing the solids removed by the swirling flow screen 20.

More specifically, the solids smaller than the opening of the open projection 22 of the swirling flow screen are settled downward by the swirling flow and stored in the solid collecting portion 50, and the solids larger than the openings are lowered by the swirling flow and gravity. It is precipitated and stored in the solids collection part 50. This stored solid can be removed at regular intervals.

Table 1 shows the removal rate of the solids having a particle diameter of 4.5 mm or more when the size of the opening of the open projection of the swirling flow screen is 5 mm, and the water surface loading rate (m 3 / m 2 / day) was set to 1,000 to 3,000.

* Volume Median: Median particle diameter

* Volume Mean: Average particle diameter

Table 2 shows the removal rate of the solid having a particle diameter of 150 ~ 500㎛ when the screen opening size is 5㎜ and the surface area loading rate (㎥ / ㎡ / day) was up to 1,000 ~ 3,000. As can be seen in Table 2, it can be seen that particles of 400 μm that are much smaller than the screen opening size of 5 mm or less are also removed by swirl flow.

According to the non-point source removal apparatus using the swirl flow screen according to the present invention, it is possible to remove polluted solids larger than the opening of the open projection of the swirl flow screen, as well as the polluted solids smaller than the size, so that high efficiency purification treatment is possible. Maintenance is easy by preventing screen blockage, and it is possible to reduce the overall equipment required area because it can operate at high surface area load rate.

Simple modifications or variations of the present invention can be readily used by those skilled in the art, and all such modifications or changes can be regarded as being included in the protection scope of the present invention.

Claims (4)

A chamber 60 constituting the body; An inlet pipe 10 mounted to one side of the chamber 60 to guide the contaminated rainwater into the swirl flow-type screen 20; A swirl flow type screen 20 installed inside the chamber 60 and having an open protrusion 22 regularly arranged; A discharge passage 30 which is disposed between the chamber 60 and the swirl flow-type screen 20 and guides the treated water in which the pollutant is separated by the swirl flow-type screen 20 to the discharge portion 40; A discharge part 40 installed at the other side of the chamber 60 to discharge the treated water to the outside; And It is composed of a solids collecting portion 50 located in the lower portion of the swirl flow-type screen 20 to collect and store the removed solids, The inlet pipe (10) is a non-point source removal device, characterized in that to gradually reduce the water flow area to flow rainwater in the tangential direction of the swirl flow screen. delete The non-point source removal apparatus according to claim 1, wherein the swirl flow-type screen (20) includes a flat portion (21) at a portion tangential to the inflow pipe (10). The method of claim 1, wherein the open projection (22) is a semi-conical protruding into the inside of the swirl flow-type screen, the opening of the open projection (22) is opened in a direction that is opposite the rainwater flowing from the inlet pipe Non-point source removal device characterized in that.

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